Although she is a hard worker, her overconfident husband doesn't pay her any attention. Moreover, he goes to establishments with women under the pretext of entertaining them and writes out receipts. Ikumi, who works as an office worker in the same workplace as her husband, feels lonely. Normally, she is plain and serious, which is her only good point. However, her mature body cannot suppress her desires, and Ikumi secretly masturbates during overtime. She is seen by her boss, Ozawa. As punishment for her shameless behavior at work, Ozawa orders her to be transferred from the office to his secretary. He orders her to become Ozawa's mistress and share his pleasures...
